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In Reply to: Re: Do I have bad pot, no I don't think so posted by trippyloaf on November 01, 2001 at 14:35:46:
I found out it was the 6.3V filament CT that I had floating. I looked on JE's site and he had his floating as well. I guess in mine it should be grounded. It looks like he also floats his negative speaker terminal tap...I always thought those should be grounded as well.
Follow Ups:
As I don't have the circuit diagram, I suppose that 6.3V-AC supply is used for the driver stage that has indirect heating cathode. In most case hum ballancer or CT is not necessary for the indirect heating tube because heater circuit is isolated.If there is no CT in your transformer, you can check it by adding hum ballancer in 6.3V. Maybe you won't be able to get the good result. For my experience I got the best (Least hum) point at the both side of hum ballancer. That ment hum ballancer wasn't necessary.
But 6.3V circuit should not be floated, as you wrote. Because floating means being coupled with stray capacitors to the signal line, and it may be affected by noise easily.
I solved similar problem by changing ground wiring and ground point before. You should better try one point grounding carefully.
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